Will This Fit?!?!?!?!?!?

i have a question....my friend has a 90 crx dx, and something is wrong with his clutch or some along those lines. because his car just stopped moving one day as he was driving. the car ran good but now it just cant move at all...no hint from the car that shows the clutch grabbing at all. so i told him that i have two clutch's that have been used but are still in good condition and heres the question..............will my 89 si clutch fit on his 90 dx???????????? hes really trying to save money so thats why im here trying to help him out but need some advice....thanks